A muffler for an internal combustion engine exhaust system includes a housing having an inlet and outlet headers enclosing opposite ends of an outer shell. A partition divides a housing interior into first and second chambers, the first chamber having sound absorbing material positioned therein. The partition has an aperture allowing fluid communication between the first and second chambers. A through pipe extends through the inlet and outlet headers and the partition and has a plurality of perforations enabling fluid communication between the through pipe and the first chamber. A valve assembly has a valve flap positioned inside the through pipe for rotation with an axle pivotally coupled to the pipe between a closed position and an open position. The valve is positioned downstream of the pipe perforations such that all of an exhaust gas flowing through the muffler passes through the valve regardless of the valve flap position.

Snap-action valve for exhaust system

A method and apparatus for manufacturing a catalytic converter is described where the catalytic converter is comprised of an outer tube member having a monolith substrate internally compressed therein with a wrapped mat material surrounding the monolith substrate and intermediate the outer tube. One or more monolith members can be applied within the outer tube and heat shields may also be applied internal to the outer tube and adjacent to the monolith substrate. The assembly of the catalytic converter includes measuring the sequence of compression of the mat material to the monolith substrate in order to understand the possible force characteristics that can be applied during the assembly thereof. The mat material is therefore compressed within the outer tube by way of compression jaws, by compression rollers, by spinning and/or by a shrinker including compression members. The compression of the mat material can be in single or multiple steps.

Method and apparatus for manufacturing a catalytic converter

The present invention is directed to a method of producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member. The method comprises the steps of (1) compressing at least a part of the absorbent member wrapped around the columnar member, by a pushing member in a radial direction toward the longitudinal axis, (2) measuring a pressure applied to the absorbent member by the pushing member, (3) measuring a distance between the axis of the columnar member and an end of the pushing member contacting the absorbent member, when the measured pressure substantially equals a predetermined target pressure, to provide a target radius, (4) inserting the columnar member and the absorbent member into the housing loosely, and (5) reducing a diameter of the housing along its longitudinal axis, with the absorbent member being compressed, to such an extent that the inner radius of the housing substantially equals the target radius, to hold the columnar member and the absorbent member compressed at the target pressure, in the housing.

Method and apparatus of producing a columnar member container

The present invention is directed to a method of producing a container such as a catalytic converter for holding a fragile substrate in a cylindrical housing with a shock absorbent member wrapped around the substrate, with an appropriate holding force determined on the basis of frictional force between the shock absorbent member and the one with the smaller coefficient of friction out of the substrate and the cylindrical housing. The method comprises the steps of (1) inserting the substrate with the shock absorbent member wrapped around the substrate, into the cylindrical housing loosely, (2) applying an axial load to the substrate so as to move the substrate along a longitudinal axis of the cylindrical housing by a predetermined distance, monitoring the axial load applied to the substrate, and (3) reducing a diameter of at least a part of the cylindrical housing with the substrate held therein along the longitudinal axis of the cylindrical housing, with the shock absorbent member being compressed, to such an extent that the axial load equals a predetermined value.

Method of producing a fragile substrate container

The present invention is directed to a method for producing a fluid treatment device having a honeycomb member in a metallic cylindrical housing with a shock absorbent member wrapped around the honeycomb member. The method comprises the steps of (1) inserting the honeycomb member with the shock absorbent member wrapped around the honeycomb member, into the cylindrical housing, (2) forming a necking portion on at least one end portion of the cylindrical housing, with a body portion thereof being clamped, and (3) reducing a diameter of at least a part of the cylindrical housing with the shock absorbent member received therein, together with the shock absorbent member, to such an extent that a desired inner diameter of the part of the cylindrical housing is provided enough to cause the shock absorbent member to produce a desired holding pressure for holding the honeycomb member in the cylindrical housing.

Method for producing a fluid treatment device having a honeycomb member

PROBLEM TO BE SOLVED: To manufacture a catalyst converter so that a catalyst support can properly be supported by reducing the diameter of a cushioning member uniformly together with a cylindrical member. SOLUTION: A catalyst support CS, around the outer periphery of which a cushioning mat MT is turned, is contained in the cylindrical member 4. Spinning work is made to a range including at least the cushioning mat MT of the cylindrical member 4 by a plurality of spinning rollers 28 arranged uniformly around the outer periphery of the cylindrical member 4, revolving round the outer periphery of the cylindrical member 4 on a circular locus having the same diameter and moving in the direction of the diameter of the cylindrical member 4 to reduce the diameter of the cushioning mat MT together with the cylindrical member 4 and support the catalyst support CS. Necking work can also be made successively to an end section of the cylindrical member 4 by means of spinning rollers 28.

Manufacturing method for catalyst converter

PROBLEM TO BE SOLVED: To provide a manufacturing method for manufacturing a purifying device for properly holding even a fragile honeycomb structure in a cylindrical vessel in a mass production process. SOLUTION: A shock absorbing member 3 is installed around the honeycomb structure (a catalyst carrier 2), and is housed in the cylindrical vessel. The shock absorbing member is held in a compressed state by diametrally contracting a shaft directional prescribed range of the cylindrical vessel over at least a shock absorbing member existing range, and a step part 12 is formed by pressing the cylindrical vessel in an opening end side prescribed position from a shaft directional end surface of the honeycomb structure. In this case, the part is worked so as to constitute shaft directional holding power in the cylindrical vessel of the honeycomb structure by shaft directional frictional force applied to the honeycomb structure by compressive restoring force of the shock absorbing member and shaft directional pressing force to the honeycomb structure by the step part. An elastic support member 4 is held in a compressed state between the shaft directional end surface of the honeycomb structure and the step part, and the compressive restoring force can be set as the shaft directional pressing force. COPYRIGHT: (C)2004,JPO

Method of manufacturing purifying device with built-in honeycomb structure

PROBLEM TO BE SOLVED: To adjust the inside diameter of a part for holding at least a cushioning member of a cylindrical member appropriately, and hold appropriately by press-inserting a pillar wounded with the cushioning member into the cylindrical member. SOLUTION: The cushioning member is compressed by pressing the cushioning member in the direction perpendicular to the axis of the pillar by a pressing body 9 in a state of winding the cushioning member (cushion mat 3) at the outer periphery of the pillar (catalyst carrier 2), the surface pressure of the cushioning member against the pillar is detected, and the predetermined distance between the axis of the pillar and the end of the pressing body is measured when the surface pressure reaches a predetermined value. The pillar wounded with the cushioning member is press-inserted into the cylindrical member of which the diameter is previously contradicted or expanded so that the actual diameter of the inside of the part holding at least the cushioning member becomes the predetermined distance. COPYRIGHT: (C)2004,JPO

Manufacturing method of pillar holding device

PROBLEM TO BE SOLVED: To improve a silencing effect in a low rotational speed region of an engine, by providing an energizing means applying a closing directional load to act in a butterfly valve to a prescribed opening from its fully closed condition, in the butterfly valve opening operated by a flow of exhaust gas. SOLUTION: In a low rotational speed region of an engine, valve closing force by a return spring 12 is strong, to hold a butterfly valve 10 in a closed condition, so as to ensure a function as a low frequency resonance chamber of an inner pipe. However, in accordance with the increasing of an engine speed, a dynamic pressure of exhaust gas rises, when the butterfly valve 10 is started to open, a link 17 is turned downward, but until its connecting pin 18 leads to a turn over position A, a compression spring 23 is compressed, its extension force acts in a closing direction of the butterfly valve 10. When the connecting pin 16 passes through the turn over position, the link 17 is turned downward, the butterfly valve 10 is opened. COPYRIGHT: (C)1997,JPO

Silencer for internal combustion engine

PROBLEM TO BE SOLVED: To machine a desired bottomed cylindrical body by smoothly and appropriately implementing the draw-spinning and the iron-spinning on a plate stock with a simple constitution. SOLUTION: A work 4 of a plate stock is held in a non-rotational manner by a bottom part of a core 3 formed in the shape as the contour of a bottomed cylindrical body targeted to be machined, and a holding bar 41 concentrically opposite to the core. The work of the plate stock is pressed and deformed to implement the draw-spinning and the iron-spinning to form the bottomed cylindrical body so that an inner surface is matched with the contour shape of the core while a plurality of rollers 28 to be revolved at equal intervals around the core and the holding bar on the circumferential locus of the same diameter are moved in the axial direction of the core and the holding bar and the revolving locus diameter of the rollers is simultaneously changed.

Manufacture of bottomed cylindrical body by spinning, and its device

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